Replacing boilers wireless thermostat

11 Oct 2020
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United Kingdom
I’m moving house and taking my hive thermostat with me. I’ve changed it over to a Salus wireless thermostat (Salus model ST620RF (TX)). I’ve switched it over but I’m just a bit worried about my wiring, and looking for someone to reassure me.

The boiler seems to be powered via the thermostat receiver. I.e. from the mains with a fuse switch to the thermostat receiver then through that to the boiler.

I have completely replicated the hive wiring (which a heating engineer did for me) so the salus is wired the exact same. Is this right?

1. First picture is the Hive wiring before I touched it (darker cable is mains). “1” on hive reflects “COM” and “3” reflects “NO” from what I read online.
2. Second picture is how I planned on wiring the Salus.
3. Third picture is the wired Salus receiver.

The Salus instructions can be found here

The instructions only seem to show for a boiler which is wired directly from the mains power, however my boiler seems to get mains power via the thermostat receiver. It also doesn’t show the link wire which I’ve done between Live and COM.

I think my main worry is COM says it’s volt free on the Salus manual but I’ve connected a link wire between live and the COM (volt free)... is this ok?

Thanks in advance

Last edited:
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I think I initially posted this in the wrong sub-forum so hope it’s ok me giving it a bump

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